High-Seed Fed-Batch Cell Culture Without Perfusion Complexity
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Solution Overview
Problem
Existing large-scale cell culture systems face challenges in achieving high viable cell densities without perfusion, particularly in fed-batch processes, leading to high costs and complications in large-scale manufacturing.
Innovation Solution
A method involving a non-perfusion-based culture system with enriched media, increasing viable cell density to at least 5×10^6 cells/mL, using batch or fed-batch bioreactors, and culturing host cells with enhanced carbon and nutrient sources, such as glucose and amino acids, to support high-seed density inoculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If perfusion cell culture is used to achieve high viable cell densities, then cell density and productivity are improved, but manufacturing cost and system complexity increase significantly
Solution Approach 1:
The invention extracts the cell retention function from the perfusion system by using a simple filtration step to remove cells from the bioreactor at harvest time, while maintaining high cell density culture. This eliminates the need for complex perfusion equipment including pumps, filters, and control systems, achieving high productivity without the associated complexity and cost.
2Productivity
If perfusion cell culture is used to achieve high viable cell densities, then cell density and productivity are improved, but manufacturing cost increases due to large media consumption
Solution Approach 1:
The invention uses fed-batch culture with controlled feeding to provide nutrients only when needed for cell growth and maintenance, rather than continuous perfusion that requires constant media replacement. This partial action approach maintains high cell densities while significantly reducing overall media consumption and associated costs.
3Device complexity
If conventional fed-batch culture with low-seed density is used, then system simplicity is maintained, but final polypeptide titer and productivity are limited
Solution Approach 1:
The invention performs preliminary cell expansion to generate a high-density seed culture before inoculating the production bioreactor. This preliminary action creates a large number of viable cells that can be inoculated at high density, enabling the simple fed-batch system to achieve high polypeptide titers that would normally require complex perfusion systems.
Data Source
AI summary
In certain embodiments, this disclosure provides novel methods of increasing the viable cell density of an N−1 large-scale bioreactor cell culture, comprising culturing a host cell expressing a recombinant poly peptide of interest in a non-perfusion-based culture system, and wherein the viable cell density is increased to at least 5×106 cells/mL. In certain embodiments, the disclosure provides novel methods for large-scale production of a recombinant polypeptide of interest, comprising: (1) culturing a host cell expressing a recombinant polypeptide of interest in an N−1 stage in a non-perfusion-based culture system, wherein the viable cell density is increased to at least 5×106 cells/mL; and (2) culturing N fed-batch production cells in an enriched media with high-seed density at least 1.5×106 cells/mL, wherein the N fed-batch production cells are inoculated from the N-1 stage in a non-perfusion-based culture system.